Jas James, chapter Epistle of James, chapter 4
You should not boast about what you will do in the future, because life is transitory. Instead, you should plan to do whatever God wants you to do, because boasting about what you want to do, rather than considering the will of God, is sinful.
James 4:13-17
Some of you are arrogantly saying, “Today or tomorrow we will go to a certain city. We will spend a year there and we will buy and sell things and earn a lot of money.” Now, you listen to me! Luk 12:18